I bought my Bangkok condo in 2009 for 6 Million THB. Paid a deposit of 5% by my UK credit card. I then transferred the full purchase price to my lawyer's Thai client account in GBP (with a little extra to cover costs and exchange rate fluctuation) from my UK bank. Very important is to get the "purpose of transfer" correctly noted. Normally "for purchase of... (add full unit info and address of the property you are buying)". You will need to show this document to Lane Department to transfer ownership to your name. Some say it is not necessary to show full address but for avoidance of issues with Land Department I put full property address and info. The extra money to cover deposit amount was used to pay lawyer's fees, taxes and to furnish my condo. I would try to get deposit amount reduced to 5% if I was you as there's few buyers in the market right now. As for your scenario B, then you would be OK if you simply put as reason of transfer "To purchase Condominium" and hope that Land Department will just accept that.